Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2006, Vol. 17 ›› Issue (2): 86

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Studies on absorption coefficients of dual-energy γ -rays and measuring error correction for multiphase fraction determination

LI Zhi-Biao* WU Ying-Xiang LI Dong-Hui   

  1. Institute of Mechanics, the Chinese Academy of Sciences, Beijing 100080, China
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LI Zhi-Biao WU Ying-Xiang LI Dong-Hui. Studies on absorption coefficients of dual-energy γ -rays and measuring error correction for multiphase fraction determination.Nuclear Science and Techniques, 2006, 17(2): 86
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Abstract: In this article, principle and mathematical method of determining the phase fractions of multiphase flows by using a dual-energy γ -ray system have been described. The dual-energy γ -ray device is composed of radioactive isotopes of 241Am and 137Cs with γ -ray energies of 59.5 and 662 keV, respectively. A rational method to calibrate the absorption coefficient was introduced in detail. The modified arithmetic is beneficial to removing the extra Compton scattering from the measured value. The result shows that the dual-energy γ -ray technique can be used in three-phase flow with average accuracy greater than 95%, which enables us to determine phase fractions almost independent of the flow regime. Improvement has been achieved on measurement accuracy of phase fractions.

Key words: Absorption coefficient, Phase fraction, Dual-energy γ -rays, Multi-phase flow, Error correction